Fluid Mechanics MCQ with Answers

16) The specific weight of water is 1000 kg/m³

Answer is:

all the above

17) Specific weight of water in S.I. units is equal to

Answer is:

9.81 x 10³ N/m³

Explanation:

Weight density or specific weight is defined as the weight per unit volume of a liquid at a standard temperature and pressure. Weight density or specific weight is usually denoted by w. Weight density or specific weight is expressed in kN/m³ or N/m³ or N/mm³.

Mathematically, weight density or specific weight,
w = ρ.g

Note: For water, w = 9.81 kN/m³ = 9.81 x 10³ N/m³ = 9.81 x 10^-6N/mm³.

18) When the flow parameters at any given instant remain same at every point, then flow is said to be

Answer is:

uniform

19) Which of the following is dimensionless

Answer is:

specific gravity

20) The normal stress in a fluid will be constant in all directions at a point only if

Answer is:

16) The specific weight of water is 1000 kg/m3

all the above

17) Specific weight of water in S.I. units is equal to

9.81 x 103 N/m3

18) When the flow parameters at any given instant remain same at every point, then flow is said to be

uniform

19) Which of the following is dimensionless

specific gravity

20) The normal stress in a fluid will be constant in all directions at a point only if

it is at rest.

16) The specific weight of water is 1000 kg/m³

9.81 x 10³ N/m³